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how to get the list of node parent parent until the final parent (root) is reached?

how to get the list of node parent parent ..... root until the final parent (root) is reached?

i.e. node, nodeparent, nodeparentparent,.....root
Is there any method like getPreProcessingNodes() or postProcessingNOdes()

I have tried this way.......need help regarding

var parentids;
function getListOfParentIds(id,accesslevelids)
    {       
        var parentid=tree.getParentId(id);
        accesslevelids=parentid+","+accesslevelids;
      
        if(parentid!="0")
        getListOfParentIds(parentid,accesslevelids);
        else
        parentids=accesslevelids;
       
        //return ""+accesslevelids;
    }
Actually when i try to return value in else part , it is giving undefined (since the loop is not yet finished, when the result has come)
So, i have taken it in a separate variable "accesslevel".

I need the function itself returning the result, ratherthan taken separately ina  variable.